import collections import configparser import enum import functools import os import pathlib import weakref import notdb._base as base import notdb._capi as capi import notdb._errors as errors import notdb._message as message import notdb._query as querymod import notdb._tags as tags __all__ = ['Database', 'AtomicContext', 'DbRevision'] def _config_pathname(): """Return the path of the configuration file. :rtype: pathlib.Path """ cfgfname = os.getenv('NOTMUCH_CONFIG', '~/.notmuch-config') return pathlib.Path(os.path.expanduser(cfgfname)) class Mode(enum.Enum): READ_ONLY = capi.lib.NOTMUCH_DATABASE_MODE_READ_ONLY READ_WRITE = capi.lib.NOTMUCH_DATABASE_MODE_READ_WRITE class QuerySortOrder(enum.Enum): OLDEST_FIRST = capi.lib.NOTMUCH_SORT_OLDEST_FIRST NEWEST_FIRST = capi.lib.NOTMUCH_SORT_NEWEST_FIRST MESSAGE_ID = capi.lib.NOTMUCH_SORT_MESSAGE_ID UNSORTED = capi.lib.NOTMUCH_SORT_UNSORTED class QueryExclude(enum.Enum): TRUE = capi.lib.NOTMUCH_EXCLUDE_TRUE FLAG = capi.lib.NOTMUCH_EXCLUDE_FLAG FALSE = capi.lib.NOTMUCH_EXCLUDE_FALSE ALL = capi.lib.NOTMUCH_EXCLUDE_ALL class Database(base.NotmuchObject): """Toplevel access to notmuch. A :class:`Database` can be opened read-only or read-write. Modifications are not atomic by default, use :meth:`begin_atomic` for atomic updates. If the underlying database has been modified outside of this class a :exc:`XapianError` will be raised and the instance must be closed and a new one created. You can use an instance of this class as a context-manager. :cvar MODE: The mode a database can be opened with, an enumeration of ``READ_ONLY`` and ``READ_WRITE`` :cvar SORT: The sort order for search results, ``OLDEST_FIRST``, ``NEWEST_FIRST``, ``MESSAGE_ID`` or ``UNSORTED``. :cvar EXCLUDE: Which messages to exclude from queries, ``TRUE``, ``FLAG``, ``FALSE`` or ``ALL``. See the query documentation for details. :cvar AddedMessage: A namedtuple ``(msg, dup)`` used by :meth:`add` as return value. :cvar STR_MODE_MAP: A map mapping strings to :attr:`MODE` items. This is used to implement the ``ro`` and ``rw`` string variants. :ivar closed: Boolean indicating if the database is closed or still open. :param path: The directory of where the database is stored. If ``None`` the location will be read from the user's configuration file, respecting the ``NOTMUCH_CONFIG`` environment variable if set. :type path: str, bytes, os.PathLike or pathlib.Path :param mode: The mode to open the database in. One of :attr:`MODE.READ_ONLY` OR :attr:`MODE.READ_WRITE`. For convenience you can also use the strings ``ro`` for :attr:`MODE.READ_ONLY` and ``rw`` for :attr:`MODE.READ_WRITE`. :type mode: :attr:`MODE` or str. :raises KeyError: if an unknown mode string is used. :raises OSError: or subclasses if the configuration file can not be opened. :raises configparser.Error: or subclasses if the configuration file can not be parsed. :raises NotmuchError: or subclasses for other failures. """ MODE = Mode SORT = QuerySortOrder EXCLUDE = QueryExclude AddedMessage = collections.namedtuple('AddedMessage', ['msg', 'dup']) _db_p = base.MemoryPointer() STR_MODE_MAP = { 'ro': MODE.READ_ONLY, 'rw': MODE.READ_WRITE, } def __init__(self, path=None, mode=MODE.READ_ONLY): if isinstance(mode, str): mode = self.STR_MODE_MAP[mode] self.mode = mode if path is None: path = self.default_path() if not hasattr(os, 'PathLike') and isinstance(path, pathlib.Path): path = bytes(path) db_pp = capi.ffi.new('notmuch_database_t **') cmsg = capi.ffi.new('char**') ret = capi.lib.notmuch_database_open_verbose(os.fsencode(path), mode.value, db_pp, cmsg) if cmsg[0]: msg = capi.ffi.string(cmsg[0]).decode(errors='replace') capi.lib.free(cmsg[0]) else: msg = None if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret, msg) self._db_p = db_pp[0] self.closed = False @classmethod def create(cls, path=None): """Create and open database in READ_WRITE mode. This is creates a new notmuch database and returns an opened instance in :attr:`MODE.READ_WRITE` mode. :param path: The directory of where the database is stored. If ``None`` the location will be read from the user's configuration file, respecting the ``NOTMUCH_CONFIG`` environment variable if set. :type path: str, bytes or os.PathLike :raises OSError: or subclasses if the configuration file can not be opened. :raises configparser.Error: or subclasses if the configuration file can not be parsed. :raises NotmuchError: if the config file does not have the database.path setting. :raises FileError: if the database already exists. :returns: The newly created instance. """ if path is None: path = cls.default_path() if not hasattr(os, 'PathLike') and isinstance(path, pathlib.Path): path = bytes(path) db_pp = capi.ffi.new('notmuch_database_t **') cmsg = capi.ffi.new('char**') ret = capi.lib.notmuch_database_create_verbose(os.fsencode(path), db_pp, cmsg) if cmsg[0]: msg = capi.ffi.string(cmsg[0]).decode(errors='replace') capi.lib.free(cmsg[0]) else: msg = None if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret, msg) # Now close the db and let __init__ open it. Inefficient but # creating is not a hot loop while this allows us to have a # clean API. ret = capi.lib.notmuch_database_destroy(db_pp[0]) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) return cls(path, cls.MODE.READ_WRITE) @staticmethod def default_path(cfg_path=None): """Return the path of the user's default database. This reads the user's configuration file and returns the default path of the database. :param cfg_path: The pathname of the notmuch configuration file. If not specified tries to use the pathname provided in the :env:`NOTMUCH_CONFIG` environment variable and falls back to :file:`~/.notmuch-config. :type cfg_path: str, bytes, os.PathLike or pathlib.Path. :returns: The path of the database, which does not necessarily exists. :rtype: pathlib.Path :raises OSError: or subclasses if the configuration file can not be opened. :raises configparser.Error: or subclasses if the configuration file can not be parsed. :raises NotmuchError if the config file does not have the database.path setting. """ if not cfg_path: cfg_path = _config_pathname() if not hasattr(os, 'PathLike') and isinstance(cfg_path, pathlib.Path): cfg_path = bytes(cfg_path) parser = configparser.ConfigParser() with open(cfg_path) as fp: parser.read_file(fp) try: return pathlib.Path(parser.get('database', 'path')) except configparser.Error: raise errors.NotmuchError( 'No database.path setting in {}'.format(cfg_path)) def __del__(self): self._destroy() @property def alive(self): try: self._db_p except errors.ObjectDestroyedError: return False else: return True def _destroy(self): try: ret = capi.lib.notmuch_database_destroy(self._db_p) except errors.ObjectDestroyedError: ret = capi.lib.NOTMUCH_STATUS_SUCCESS else: self._db_p = None if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) def close(self): """Close the notmuch database. Once closed most operations will fail. This can still be useful however to explicitly close a database which is opened read-write as this would otherwise stop other processes from reading the database while it is open. :raises ObjectDestroyedError: if used after destroyed. """ ret = capi.lib.notmuch_database_close(self._db_p) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) self.closed = True def __enter__(self): return self def __exit__(self, exc_type, exc_value, traceback): self.close() @property def path(self): """The pathname of the notmuch database. This is returned as a :class:`pathlib.Path` instance. :raises ObjectDestroyedError: if used after destoryed. """ try: return self._cache_path except AttributeError: ret = capi.lib.notmuch_database_get_path(self._db_p) self._cache_path = pathlib.Path(os.fsdecode(capi.ffi.string(ret))) return self._cache_path @property def version(self): """The database format version. This is a positive integer. :raises ObjectDestroyedError: if used after destoryed. """ try: return self._cache_version except AttributeError: ret = capi.lib.notmuch_database_get_version(self._db_p) self._cache_version = ret return ret @property def needs_upgrade(self): """Whether the database should be upgraded. If *True* the database can be upgraded using :meth:`upgrade`. Not doing so may result in some operations raising :exc:`UpgradeRequiredError`. A read-only database will never be upgradable. :raises ObjectDestroyedError: if used after destoryed. """ ret = capi.lib.notmuch_database_needs_upgrade(self._db_p) return bool(ret) def upgrade(self, progress_cb=None): """Upgrade the database to the latest version. Upgrade the database, optionally with a progress callback which should be a callable which will be called with a floating point number in the range of [0.0 .. 1.0]. """ raise NotImplementedError def atomic(self): """Return a context manager to perform atomic operations. The returned context manager can be used to perform atomic operations on the database. .. note:: Unlinke a traditional RDBMS transaction this does not imply durability, it only ensures the changes are performed atomically. :raises ObjectDestroyedError: if used after destoryed. """ ctx = AtomicContext(self, '_db_p') return ctx def revision(self): """The currently committed revision in the database. Returned as a ``(revision, uuid)`` namedtuple. :raises ObjectDestroyedError: if used after destoryed. """ raw_uuid = capi.ffi.new('char**') rev = capi.lib.notmuch_database_get_revision(self._db_p, raw_uuid) return DbRevision(rev, capi.ffi.string(raw_uuid[0])) def get_directory(self, path): raise NotImplementedError def add(self, filename, *, sync_flags=False): """Add a message to the database. Add a new message to the notmuch database. The message is referred to by the pathname of the maildir file. If the message ID of the new message already exists in the database, this adds ``pathname`` to the list of list of files for the existing message. :param filename: The path of the file containing the message. :type filename: str, bytes, os.PathLike or pathlib.Path. :param sync_flags: Whether to sync the known maildir flags to notmuch tags. See :meth:`Message.flags_to_tags` for details. :returns: A tuple where the first item is the newly inserted messages as a :class:`Message` instance, and the second item is a boolean indicating if the message inserted was a duplicate. This is the namedtuple ``AddedMessage(msg, dup)``. :rtype: Database.AddedMessage If an exception is raised, no message was added. :raises XapianError: A Xapian exception occurred. :raises FileError: The file referred to by ``pathname`` could not be opened. :raises FileNotEmailError: The file referreed to by ``pathname`` is not recognised as an email message. :raises ReadOnlyDatabaseError: The database is opened in READ_ONLY mode. :raises UpgradeRequiredError: The database must be upgraded first. :raises ObjectDestroyedError: if used after destoryed. """ if not hasattr(os, 'PathLike') and isinstance(filename, pathlib.Path): filename = bytes(filename) msg_pp = capi.ffi.new('notmuch_message_t **') ret = capi.lib.notmuch_database_add_message(self._db_p, os.fsencode(filename), msg_pp) ok = [capi.lib.NOTMUCH_STATUS_SUCCESS, capi.lib.NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID] if ret not in ok: raise errors.NotmuchError(ret) msg = message.Message(self, msg_pp[0], db=self) if sync_flags: msg.tags.from_maildir_flags() return self.AddedMessage( msg, ret == capi.lib.NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID) def remove(self, filename): """Remove a message from the notmuch database. Removing a message which is not in the database is just a silent nop-operation. :param filename: The pathname of the file containing the message to be removed. :type filename: str, bytes, os.PathLike or pathlib.Path. :returns: True if the message is still in the database. This can happen when multiple files contain the same message ID. The true/false distinction is fairly arbitrary, but think of it as ``dup = db.remove_message(name); if dup: ...``. :rtype: bool :raises XapianError: A Xapian exception ocurred. :raises ReadOnlyDatabaseError: The database is opened in READ_ONLY mode. :raises UpgradeRequiredError: The database must be upgraded first. :raises ObjectDestroyedError: if used after destoryed. """ if not hasattr(os, 'PathLike') and isinstance(filename, pathlib.Path): filename = bytes(filename) ret = capi.lib.notmuch_database_remove_message(self._db_p, os.fsencode(filename)) ok = [capi.lib.NOTMUCH_STATUS_SUCCESS, capi.lib.NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID] if ret not in ok: raise errors.NotmuchError(ret) if ret == capi.lib.NOTMUCH_STATUS_DUPLICATE_MESSAGE_ID: return True else: return False def find(self, msgid): """Return the message matching the given message ID. If a message with the given message ID is found a :class:`Message` instance is returned. Otherwise a :exc:`LookupError` is raised. :param msgid: The message ID to look for. :type msgid: str :returns: The message instance. :rtype: Message :raises LookupError: If no message was found. :raises OutOfMemoryError: When there is no memory to allocate the message instance. :raises XapianError: A Xapian exception ocurred. :raises ObjectDestroyedError: if used after destoryed. """ msg_pp = capi.ffi.new('notmuch_message_t **') ret = capi.lib.notmuch_database_find_message(self._db_p, msgid.encode(), msg_pp) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) msg_p = msg_pp[0] if msg_p == capi.ffi.NULL: raise LookupError msg = message.Message(self, msg_p, db=self) return msg def get(self, filename): """Return the :class:`Message` given a pathname. If a message with the given pathname exists in the database return the :class:`Message` instance for the message. Otherwise raise a :exc:`LookupError` exception. :param filename: The pathname of the message. :type filename: str, bytes, os.PathLike or pathlib.Path :returns: The message instance. :rtype: Message :raises LookupError: If no message was found. This is also a subclass of :exc:`KeyError`. :raises OutOfMemoryError: When there is no memory to allocate the message instance. :raises XapianError: A Xapian exception ocurred. :raises ObjectDestroyedError: if used after destoryed. """ if not hasattr(os, 'PathLike') and isinstance(filename, pathlib.Path): filename = bytes(filename) msg_pp = capi.ffi.new('notmuch_message_t **') ret = capi.lib.notmuch_database_find_message_by_filename( self._db_p, os.fsencode(filename), msg_pp) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) msg_p = msg_pp[0] if msg_p == capi.ffi.NULL: raise LookupError msg = message.Message(self, msg_p, db=self) return msg @property def tags(self): """Return an immutable set with all tags used in this database. This returns an immutable set-like object implementing the collections.abc.Set Abstract Base Class. Due to the underlying libnotmuch implementation some operations have different performance characteristics then plain set objects. Mainly any lookup operation is O(n) rather then O(1). Normal usage treats tags as UTF-8 encoded unicode strings so they are exposed to Python as normal unicode string objects. If you need to handle tags stored in libnotmuch which are not valid unicode do check the :class:`ImmutableTagSet` docs for how to handle this. :rtype: ImmutableTagSet :raises ObjectDestroyedError: if used after destoryed. """ try: ref = self._cached_tagset except AttributeError: tagset = None else: tagset = ref() if tagset is None: tagset = tags.ImmutableTagSet( self, '_db_p', capi.lib.notmuch_database_get_all_tags) self._cached_tagset = weakref.ref(tagset) return tagset def _create_query(self, query, *, omit_excluded=EXCLUDE.TRUE, sort=SORT.UNSORTED, # Check this default exclude_tags=None): """Create an internal query object. :raises OutOfMemoryError: if no memory is available to allocate the query. """ if isinstance(query, str): query = query.encode('utf-8') query_p = capi.lib.notmuch_query_create(self._db_p, query) if query_p == capi.ffi.NULL: raise errors.OutOfMemoryError() capi.lib.notmuch_query_set_omit_excluded(query_p, omit_excluded.value) capi.lib.notmuch_query_set_sort(query_p, sort.value) if exclude_tags is not None: for tag in exclude_tags: if isinstance(tag, str): tag = str.encode('utf-8') capi.lib.notmuch_query_add_tag_exclude(query_p, tag) return querymod.Query(self, query_p) def messages(self, query, *, omit_excluded=EXCLUDE.TRUE, sort=SORT.UNSORTED, # Check this default exclude_tags=None): """Search the database for messages. :returns: An iterator over the messages found. :rtype: MessageIter :raises OutOfMemoryError: if no memory is available to allocate the query. :raises ObjectDestroyedError: if used after destoryed. """ query = self._create_query(query, omit_excluded=omit_excluded, sort=sort, exclude_tags=exclude_tags) return query.messages() def count_messages(self, query, *, omit_excluded=EXCLUDE.TRUE, sort=SORT.UNSORTED, # Check this default exclude_tags=None): """Search the database for messages. :returns: An iterator over the messages found. :rtype: MessageIter :raises ObjectDestroyedError: if used after destoryed. """ query = self._create_query(query, omit_excluded=omit_excluded, sort=sort, exclude_tags=exclude_tags) return query.count_messages() def threads(self, query, *, omit_excluded=EXCLUDE.TRUE, sort=SORT.UNSORTED, # Check this default exclude_tags=None): query = self._create_query(query, omit_excluded=omit_excluded, sort=sort, exclude_tags=exclude_tags) return query.threads() def count_threads(self, query, *, omit_excluded=EXCLUDE.TRUE, sort=SORT.UNSORTED, # Check this default exclude_tags=None): query = self._create_query(query, omit_excluded=omit_excluded, sort=sort, exclude_tags=exclude_tags) return query.count_threads() def status_string(self): raise NotImplementedError def __repr__(self): return 'Database(path={self.path}, mode={self.mode})'.format(self=self) class AtomicContext: """Context manager for atomic support. This supports the notmuch_database_begin_atomic and notmuch_database_end_atomic API calls. The object can not be directly instantiated by the user, only via ``Database.atomic``. It does keep a reference to the :class:`Database` instance to keep the C memory alive. :raises XapianError: When this is raised at enter time the atomic section is not active. When it is raised at exit time the atomic section is still active and you may need to try using :meth:`force_end`. :raises ObjectDestroyedError: if used after destoryed. """ def __init__(self, db, ptr_name): self._db = db self._ptr = lambda: getattr(db, ptr_name) def __del__(self): self._destroy() @property def alive(self): return self.parent.alive def _destroy(self): pass def __enter__(self): ret = capi.lib.notmuch_database_begin_atomic(self._ptr()) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) return self def __exit__(self, exc_type, exc_value, traceback): ret = capi.lib.notmuch_database_end_atomic(self._ptr()) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) def force_end(self): """Force ending the atomic section. This can only be called once __exit__ has been called. It will attept to close the atomic section (again). This is useful if the original exit raised an exception and the atomic section is still open. But things are pretty ugly by now. :raises XapianError: If exiting fails, the atomic section is not ended. :raises UnbalancedAtomicError: If the database was currently not in an atomic section. :raises ObjectDestroyedError: if used after destoryed. """ ret = capi.lib.notmuch_database_end_atomic(self._ptr()) if ret != capi.lib.NOTMUCH_STATUS_SUCCESS: raise errors.NotmuchError(ret) @functools.total_ordering class DbRevision: """A database revision. The database revision number increases monotonically with each commit to the database. Which means user-visible changes can be ordered. This object is sortable with other revisions. It carries the UUID of the database to ensure it is only ever compared with revisions from the same database. """ def __init__(self, rev, uuid): self._rev = rev self._uuid = uuid @property def rev(self): """The revision number, a positive integer.""" return self._rev @property def uuid(self): """The UUID of the database, consider this opaque.""" return self._uuid def __eq__(self, other): if isinstance(other, self.__class__): if self.uuid != other.uuid: return False return self.rev == other.rev else: return NotImplemented def __lt__(self, other): if self.__class__ is other.__class__: if self.uuid != other.uuid: return False return self.rev < other.rev else: return NotImplemented def __repr__(self): return 'DbRevision(rev={self.rev}, uuid={self.uuid})'.format(self=self)